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DisclaimerUnofficial, and not affiliated with Anthropic. Nearly all of this is read straight out of what ships: npm bundles, captured prompts, published docs. Anthropic's own notes go in verbatim, marked as theirs. The rest is my reading, and every entry carries the strings behind it. If one looks wrong, vote it down and say why.

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Claude Code v2.1.248 27 Aug 2026

MCP token counts no longer include tools the model never sees

You'll notice

Useful4 Signal3

MCP

MCP token counts now exclude tools that were never sent to the model.

What

The MCP context and token breakdown now compares the full tool list against the set actually sent to the model. Tools that are held back report zero tokens and show as not loaded, and their tokens are removed from the total. If every MCP tool is held back, the total is 0.

Evidence

mcpToolTokens

Strings lifted out of the shipped bundle, so the claim above can be checked against them.

See this entry in the whole of v2.1.248 →